Communications Systems | PRS xBxxx Basic Amplifiers
PRS xBxxx Basic Amplifiers
www.boschsecurity.com
u High efficiency class-D amplifier channel(s)
u Switched mode power supply
u Local audio inputs
u Mains and battery operation
u Complete supervision
The basic amplifiers are cost effective alternatives to the regular Praesideo power amplifiers, for situations where no built-in digital signal processing functions, such as equalizers, delay and AVC are required. They do not have a Praesideo network connection. Instead, these amplifiers are connected to the Praesideo network via the PRS-16MCI Multi Channel Interface, which provides the basic amplifier with audio signals and has full control. There are four versions, the PRS 1B500 (1 x 500 W), PRS 2B250 (2 x 250 W), PRS 4B125 (4 x 125 W) and the PRS 8B060
(8 x 60 W).
The basic amplifiers are completely supervised and fault events are reported via the multi channel interface to the Praesideo network controller.
The basic amplifiers provide connections for separate group A and group B loudspeakers for each zone, and support class A loudspeaker loop wiring. The units should be mounted in a 19"-rack with the included mounting brackets.
Notice
Region specific versions of these amplifiers are indicated by a suffix to the typenumber (-EU, - CN, ...). The amplifiers are completely identical, but may differ in certifications, power cord and country of origin.
Functions
Amplification
The PRS 1B500 is a single channel, 500 W unit, the PRS 2B250 is a two-channel amplifier with 250 W per channel, the PRS 4B125 is a four channel amplifier with 125 W per channel and the PRS 8B060 is an eight channel amplifier with 60 W per channel. The power supply is switched mode with low inrush current and the units can run on 48 V, battery stand-by power.
Connection
The amplifiers have built-in output transformers for driving 70 and 100 V loudspeakers. They have separate overload-protected group A and group B loudspeaker connections, which support class-A loop wiring. The separate A and B groups of each channel can be
2 | PRS xBxxx Basic Amplifiers
configured for redundancy. The units connect to the PRS-16MCI Multi Channel Interface for audio, control and supervision, but stand-alone operation is possible.
Audio
The amplifiers have analog audio line inputs for low priority local audio. Networked audio from the multi channel interface overrides the local audio.
Security
The units operate both on mains power and on a 48 V battery power supply for emergency back up, with automatic switchover. They supervise both of the power supplies, as well as themselves. They can optionally monitor loudspeakers and their lines, when used together with the PRS-16MCI Multi Channel Interface. Complete channel separation allows one channel of the amplifier to function as a spare amplifier for the other amplifier channel.
The amplifier has overload and short circuit protection. An overheat protection circuit switches off the power stage and activates the fault LED on the front panel if the internal temperature reaches a critical limit.
Controls and indicators
Front
•Two two-color LEDs for mains and battery status
•Four amplifier status/level LEDs (per channel)
Back
•Mains on/off switch
•Mains voltage selector
•Rotary volume control for local audio inputs (per channel)
Inside
• 70 V / 100 V selection (per channel)
Interconnection
Back
•Mains socket
•Battery backup input
•Two loudspeaker output screw terminals (per channel)
•Spare amplifier input screw terminal (per channel)
•Two RJ45 connectors (per channel)
•Local audio input screw terminal (per channel)
Certifications and approvals
Safety |
acc. to IEC 60065 / EN 60065 |
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Immunity |
acc. to EN 55103 2 / EN 50130 4 / |
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EN 50121 4 |
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Emissions |
acc. to EN 55103-1 / FCC-47 part 15B |
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Emergency |
acc. to EN 60849 / EN 54 16 / |
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ISO 7240 16 |
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Maritime |
acc. to IEC 60945 |
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Region Certification
Europe CE
CE DOP
CPD
GL
Parts included
Quantity Component
1PRS-1B500 Basic Amplifier 1x500 W or
PRS-2B250 Basic Amplifier 2x250 W or
PRS 4B125 Basic Amplifier 4x125 W or
PRS 8B060 Basic Amplifier 8x60 W
2/4/8/1 CAT 5 cables (for PRS 1B500 / PRS 2B250 /
6PRS 4B125 / PRS 8B060)
1Power cord
1Set of mounting brackets (large) for 19” rack
1Set connectors
Technical specifications
Electrical
Mains power supply
Voltage |
115/230 VAC ±10%, 50/60 Hz |
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Power consumption |
Pmax -3 dB* / idle** / standby |
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PRS-1B500 |
450 |
/ 52 / 17 W |
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PRS-2B250 |
378 |
/ 46 / 18 W |
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PRS 4B125 |
395 |
/ 62 / 16 W |
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PRS 8B060 |
400 |
/ 80 / 16 W |
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* Alarm tone level |
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** With pilot tone 15 V |
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Battery power supply |
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Voltage |
48 VDC -10% to +20% |
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Power consumption |
Pmax -3 dB* / idle** / standby |
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PRS-1B500 |
365 |
/ 34 |
/ 6 W |
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PRS-2B250 |
370 |
/ 38 |
/ 6 W |
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PRS 4B125 |
375 |
/ 48 |
/ 9 W |
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PRS 8B060 |
385 |
/ 62 |
/ 10 W |
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* Alarm tone level |
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** With pilot tone 15 V |
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Performance |
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Frequency response |
60 Hz to 19 kHz (-3 dB) |
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